TM 1-1520-238-T-4688628.OIL PSI MAIN XMSN 2 INDICATOR  DOES NOT LIGHT WITH ELECTRICAL POWER 628APPLIED AND ALL POWER PLANTS OFFTools:NomenclaturePartNumberTool Kit, ElectricalSC518099CLA06RepairersMultimeter, DigitalAN/PSM-45Personnel Required:68XArmament/Electrical Systems RepairerReferences:TM 1-1520-238-T-6TM 1-1520-238-23Equipment Conditions:RefConditionTM 1-1520-238-23Access provisions  R200 panel removedWARNINGTurn off power before detaching orattaching wires and connectors. Highcurrent 28 VDC or 115 VAC is present.Failure to do so could result in death orserious injury.1. Check for open between J75515 and J75516.Does open exist?YESReplace main transmission oilsystem 2 low oil pressure switch(TM 1-1520-238-23).NOGo to step 2.2. Check for open between:P1810 and J456A1,J456A1 and P75515,P75516 and ground.Does open exist?YESRepair open wire.Go to paragraph 612.NORefer to TM 1-1520-238-T-6 totroubleshoot the pilotcaution/warning system.END OF TASK